Insecticidal composition.



WILLIAM :a. iracniamn aim nnwaan ,c. -nor.ron, or-cnnvnnan'n, onrahssreuoBS' TO THE SHERWIN WILLIAMS COMPANY, OF CLEVELAND, OHIO, A. CORPORATION OF rnsacricinal. corarcsrrion.

No Drawing. Original application filed Iiarch 13, 1915, Serial No. 14,163. Divided and. this application filed Qctober 17, 1916, Serial No. 126,176.

To all whom it may concern:

Be it known that we, Wnmnlir- R. MACK- LIND and EDWARD S. ll-lon'ron citizens of the United States, and residents of Cleveland,

county of Cuyahoga, and State of Ohio,

when properly combined with other ingredients constitutes an effective and relatively inexpensive insecticidial composition. The present application is a division of our Patent No. 1,243,323 issued October 16, 1917, on application Serial No. 14,163, filed March To the accomplishment of the foregoing and related ends, said invention, then consists of the ingredients hereinafter fully described and particularly pointed out in the claims.

The following description sets forth in detail one approved combination of ingredients embodylng our invention, such disclosed means constituting, however, but one of various forms in which the principle of the invention may be used.

In the smelting of copper and other ores the fumes contain many compounds,-ch iefly oxids of zinc, lead, arsenic, iron, magnes1um, etc, and sulfids and anhydrlds of other elements. Heretofore, no use has been known forthe recovered smelter fume and thepresent invention is intended for the purpose of I utilizing this waste product.

The fumes from copper smelters are at present not only often entirely wasted, but when permitted to escape are very injurious to the health .of the neighborhood surround ing the smelter, so much so in fact that several methods have been attemptedto prevent the escape of these fumes. Smelter fumes vary in their composition according to the smelter from; which they come, the main constituents being zinc oxid, arsenic compounds, lead om'd and sulfuric anhyfids of many other metals 1n small or negli gible quantities. In the usual fume there is approximately l0 per cent. of zinc om'd, 25 per cent. of ulfuric anhydrid, 10 per cent. of lead oXid, and approximately 10 per cent. of arsenic compounds.

In theproduction of the present invention, we preferably use smelter fume containing from ten to twenty-five per cent. of arsenic compounds by weight. If the percentage'is less than ten, it ma be increased by removing some of the 01'; or com: pounds, by leaching out the water soluble ones or by removing them in any preferred manner. than twenty-five per cent. it may be reduced by adding suitable materials such for example, as zinc or calcium oxid or hydroxidl 'More often, however, the recovered fumes of varying arsenic content may be mixed together to produce a product having an arsenic content within the desired limits.

This initial product must then be made safe for use and must be changed into a material that suspends well in water for use as a spray. This is effected by mixing with the recovered fume an amount of calcium oxid equal to about thirty per cent. of the weight of the arsenic content therein or an amount of calcium hydroxid equal to about forty per cent. of the weight of the arsenic content. In this manner we convert a heretofore dangerous and waste product into avaluable insecticide which is well adapted for use as a spray and very eifective for the purpose desired.

Not only is our new insecticide effective but also the process of maln'ng the same is simple and relatively inexpensive, involving but few operations and being capable of employment without the necessity of providing expensive and complicated apparatus.

Other modes of applying the principle of our invention may be employed instead of the one explained, change being made as regards the materials employed, rovided the ingredients statedby any of t 'e following claims or the. equivalent of such stated ingredients be employed.

If the arsenic content is greaterv Patented oet. as, 1917.

We therefore-particularly point out'anc't distinctly claim as-our invention 1. A composition of matter comprising an arsenic-containing recovered smelter fume '5 dust in intimate intermixture with calcium exid in amount less than one halfthe arsenic: content of the fume;

L 2. A pomposition of matter comprising an arsenic oontaming j recovered smelter fume dust in mtlmate internnxture with cal 10 .cium oxid in amount 'equalvto 30 per cent. of

the arsenic content of the fume.

Signed by us, this 12th day of October, 

